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https://issues.apache.org/jira/browse/DRILL-6794?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arina Ielchiieva updated DRILL-6794:
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Fix Version/s: (was: 1.17.0)
> Document the JDBC properties required to retrieve result sets in batches
> while querying large tables
> ----------------------------------------------------------------------------------------------------
>
> Key: DRILL-6794
> URL: https://issues.apache.org/jira/browse/DRILL-6794
> Project: Apache Drill
> Issue Type: Bug
> Components: Documentation
> Affects Versions: 1.14.0
> Reporter: Rahul Raj
> Assignee: Bridget Bevens
> Priority: Major
> Labels: doc-impacting
>
> Document the JDBC properties required to retrieve result sets in batches
> while querying large tables
> Querying large tables using JDBC plugin causes OOM as most JDBC drivers cache
> the entire result set at the client by default.
> To avoid this additional parameters needs to be specified with the JDBC
> connection string so that the driver fetches records in batches and reloads
> when exhausted.
> For postgres driver set autocommit mode to false -
> jdbc:postgresql://url:port/schema?defaultAutoCommit=false
> Links
> [1] https://issues.apache.org/jira/browse/DRILL-4177
> [2] https://jdbc.postgresql.org/documentation/93/query.html#fetchsize-example
> [3] https://www.postgresql.org/docs/9.3/static/ecpg-sql-set-autocommit.html
> [4] https://jdbc.postgresql.org/documentation/head/ds-cpds.htm
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